40w White U Fluorescent Tube

Colour Ref numbers
Standard (Halophosphate)
23 / 35 or 135 = White - 3500K
29 / 30 or 129 = Warm White - 3000K
20 / 33 or 133 = Cool White - 4000K
10 / 54 or 154 = Daylight - 6000K

Triphosphor tubes
835 = White - 3500K
830 = Warm White - 3000K
840 = Cool White - 4000K
860/865/765 = Daylight - 6000K